/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Nov 5, 2007
*/
package com.bigdata.rdf.spo;
import java.io.IOException;
import java.io.ObjectStreamException;
import com.bigdata.rdf.model.StatementEnum;
import com.bigdata.relation.accesspath.IElementFilter;
/**
* Filters out {@link StatementEnum#History} {@link ISPO}s.
*/
final public class HistorySPOFilter<E extends ISPO> extends SPOFilter<ISPO> {
/**
*
*/
private static final long serialVersionUID = 9130715011217566313L;
/**
* Shared instance.
*/
static public final transient IElementFilter<ISPO> INSTANCE = new HistorySPOFilter<ISPO>();
/**
* De-serialization constructor.
*/
private HistorySPOFilter() {
}
public boolean isValid(Object o) {
if (!canAccept(o)) {
return true;
}
return accept((ISPO) o);
}
private boolean accept(final ISPO o) {
final ISPO spo = (ISPO) o;
return spo.getStatementType() != StatementEnum.History;
}
/**
* Imposes the canonicalizing mapping during object de-serialization.
*/
private Object readResolve() throws ObjectStreamException {
return INSTANCE;
}
private void writeObject(java.io.ObjectOutputStream out) throws IOException {
// NOP - stateless.
}
private void readObject(java.io.ObjectInputStream in) throws IOException,
ClassNotFoundException {
// NOP - stateless.
}
}